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Diffstat (limited to 'html/baremetal/102keyboard.subx.html')
| -rw-r--r-- | html/baremetal/102keyboard.subx.html | 83 |
1 files changed, 43 insertions, 40 deletions
diff --git a/html/baremetal/102keyboard.subx.html b/html/baremetal/102keyboard.subx.html index cc092133..660d74fb 100644 --- a/html/baremetal/102keyboard.subx.html +++ b/html/baremetal/102keyboard.subx.html @@ -56,46 +56,49 @@ if ('onhashchange' in window) { <pre id='vimCodeElement'> <span id="L1" class="LineNr"> 1 </span><span class="subxComment"># check keyboard for a key</span> <span id="L2" class="LineNr"> 2 </span><span class="subxComment"># return 0 on no keypress or unrecognized key</span> -<span id="L3" class="LineNr"> 3 </span><span class="subxFunction">read-key</span>: <span class="subxComment"># kbd: (addr keyboard) -> result/eax: byte</span> -<span id="L4" class="LineNr"> 4 </span> <span class="subxS1Comment"># . prologue</span> -<span id="L5" class="LineNr"> 5 </span> 55/push-ebp -<span id="L6" class="LineNr"> 6 </span> 89/<- %ebp 4/r32/esp -<span id="L7" class="LineNr"> 7 </span> <span class="subxS1Comment"># . save registers</span> -<span id="L8" class="LineNr"> 8 </span> 51/push-ecx -<span id="L9" class="LineNr"> 9 </span> <span class="subxComment"># result = 0</span> -<span id="L10" class="LineNr">10 </span> b8/copy-to-eax 0/imm32 -<span id="L11" class="LineNr">11 </span> <span class="subxComment"># ecx = keyboard</span> -<span id="L12" class="LineNr">12 </span> 8b/-> *(ebp+8) 1/r32/ecx -<span id="L13" class="LineNr">13 </span> 81 7/subop/compare %ecx 0/imm32 -<span id="L14" class="LineNr">14 </span> { -<span id="L15" class="LineNr">15 </span> 75/jump-if-!= <span class="Constant">break</span>/disp8 -<span id="L16" class="LineNr">16 </span> <span class="subxComment"># var read/ecx: byte = keyboard buffer's read index</span> -<span id="L17" class="LineNr">17 </span> 8b/-> *0x7dcc 1/r32/CL <span class="subxComment"># keyboard-buffer-read</span> -<span id="L18" class="LineNr">18 </span> <span class="subxComment"># var next-key/eax: byte = *(keyboard buffer + ecx)</span> -<span id="L19" class="LineNr">19 </span> 8a/byte-> *(ecx+0x7dd0) 0/r32/AL <span class="subxComment"># keyboard-buffer-data</span> -<span id="L20" class="LineNr">20 </span> <span class="subxComment"># if (next-key != 0) lock and remove from keyboard-buffer</span> -<span id="L21" class="LineNr">21 </span> 81 7/subop/compare %eax 0/imm32 -<span id="L22" class="LineNr">22 </span> { -<span id="L23" class="LineNr">23 </span> 74/jump-if-= <span class="Constant">break</span>/disp8 -<span id="L24" class="LineNr">24 </span> <span class="subxComment"># TODO: add some instructions in this block to SubX if we ever want to</span> -<span id="L25" class="LineNr">25 </span> <span class="subxComment"># use bootstrap on baremetal programs</span> -<span id="L26" class="LineNr">26 </span> fa/disable-interrupts -<span id="L27" class="LineNr">27 </span> c6 0/subop/copy-byte *(ecx+0x7dd0) 0/imm8 -<span id="L28" class="LineNr">28 </span> ff 0/subop/increment *0x7dcc <span class="subxComment"># keyboard-buffer-read</span> -<span id="L29" class="LineNr">29 </span> 81 4/subop/and *0x7dcc 0xf/imm32 <span class="subxComment"># keyboard-buffer-read</span> -<span id="L30" class="LineNr">30 </span> fb/enable-interrupts -<span id="L31" class="LineNr">31 </span> } -<span id="L32" class="LineNr">32 </span> <span class="subxComment"># return</span> -<span id="L33" class="LineNr">33 </span> eb $read-key:end/disp8 -<span id="L34" class="LineNr">34 </span> } -<span id="L35" class="LineNr">35 </span> <span class="subxComment"># TODO: fake keyboard</span> -<span id="L36" class="LineNr">36 </span><span class="Constant">$read-key:end</span>: -<span id="L37" class="LineNr">37 </span> <span class="subxS1Comment"># . restore registers</span> -<span id="L38" class="LineNr">38 </span> 59/pop-to-ecx -<span id="L39" class="LineNr">39 </span> <span class="subxS1Comment"># . epilogue</span> -<span id="L40" class="LineNr">40 </span> 89/<- %esp 5/r32/ebp -<span id="L41" class="LineNr">41 </span> 5d/pop-to-ebp -<span id="L42" class="LineNr">42 </span> c3/return +<span id="L3" class="LineNr"> 3 </span> +<span id="L4" class="LineNr"> 4 </span>== code +<span id="L5" class="LineNr"> 5 </span> +<span id="L6" class="LineNr"> 6 </span><span class="subxFunction">read-key</span>: <span class="subxComment"># kbd: (addr keyboard) -> result/eax: byte</span> +<span id="L7" class="LineNr"> 7 </span> <span class="subxS1Comment"># . prologue</span> +<span id="L8" class="LineNr"> 8 </span> 55/push-ebp +<span id="L9" class="LineNr"> 9 </span> 89/<- %ebp 4/r32/esp +<span id="L10" class="LineNr">10 </span> <span class="subxS1Comment"># . save registers</span> +<span id="L11" class="LineNr">11 </span> 51/push-ecx +<span id="L12" class="LineNr">12 </span> <span class="subxComment"># result = 0</span> +<span id="L13" class="LineNr">13 </span> b8/copy-to-eax 0/imm32 +<span id="L14" class="LineNr">14 </span> <span class="subxComment"># ecx = keyboard</span> +<span id="L15" class="LineNr">15 </span> 8b/-> *(ebp+8) 1/r32/ecx +<span id="L16" class="LineNr">16 </span> 81 7/subop/compare %ecx 0/imm32 +<span id="L17" class="LineNr">17 </span> { +<span id="L18" class="LineNr">18 </span> 75/jump-if-!= <span class="Constant">break</span>/disp8 +<span id="L19" class="LineNr">19 </span> <span class="subxComment"># var read/ecx: byte = keyboard buffer's read index</span> +<span id="L20" class="LineNr">20 </span> 8b/-> *0x7dcc 1/r32/CL <span class="subxComment"># keyboard-buffer-read</span> +<span id="L21" class="LineNr">21 </span> <span class="subxComment"># var next-key/eax: byte = *(keyboard buffer + ecx)</span> +<span id="L22" class="LineNr">22 </span> 8a/byte-> *(ecx+0x7dd0) 0/r32/AL <span class="subxComment"># keyboard-buffer-data</span> +<span id="L23" class="LineNr">23 </span> <span class="subxComment"># if (next-key != 0) lock and remove from keyboard-buffer</span> +<span id="L24" class="LineNr">24 </span> 81 7/subop/compare %eax 0/imm32 +<span id="L25" class="LineNr">25 </span> { +<span id="L26" class="LineNr">26 </span> 74/jump-if-= <span class="Constant">break</span>/disp8 +<span id="L27" class="LineNr">27 </span> <span class="subxComment"># TODO: add some instructions in this block to SubX if we ever want to</span> +<span id="L28" class="LineNr">28 </span> <span class="subxComment"># use bootstrap on baremetal programs</span> +<span id="L29" class="LineNr">29 </span> fa/disable-interrupts +<span id="L30" class="LineNr">30 </span> c6 0/subop/copy-byte *(ecx+0x7dd0) 0/imm8 +<span id="L31" class="LineNr">31 </span> ff 0/subop/increment *0x7dcc <span class="subxComment"># keyboard-buffer-read</span> +<span id="L32" class="LineNr">32 </span> 81 4/subop/and *0x7dcc 0xf/imm32 <span class="subxComment"># keyboard-buffer-read</span> +<span id="L33" class="LineNr">33 </span> fb/enable-interrupts +<span id="L34" class="LineNr">34 </span> } +<span id="L35" class="LineNr">35 </span> <span class="subxComment"># return</span> +<span id="L36" class="LineNr">36 </span> eb $read-key:end/disp8 +<span id="L37" class="LineNr">37 </span> } +<span id="L38" class="LineNr">38 </span> <span class="subxComment"># TODO: fake keyboard</span> +<span id="L39" class="LineNr">39 </span><span class="Constant">$read-key:end</span>: +<span id="L40" class="LineNr">40 </span> <span class="subxS1Comment"># . restore registers</span> +<span id="L41" class="LineNr">41 </span> 59/pop-to-ecx +<span id="L42" class="LineNr">42 </span> <span class="subxS1Comment"># . epilogue</span> +<span id="L43" class="LineNr">43 </span> 89/<- %esp 5/r32/ebp +<span id="L44" class="LineNr">44 </span> 5d/pop-to-ebp +<span id="L45" class="LineNr">45 </span> c3/return </pre> </body> </html> |